I get the feeling that looking at the streamer, dac, cables etc is looking the wrong way.
First, I would check the source. Test music in mono, if you can do it. Use good natural sounding recordings that have a focus on the central image. Avoid fancy productions and stereo on stereoids with overbusy left and right channels. With good sources you should get a clear central image, at least from the vinyl. Check that the volume from mono recordings sounds exactly balanced, left and right. There is your phantom centre. In fact, with mono, that's all you hear.
Next I would check speaker placement. Maybe your speakers should be moved closer together. You say music sounds "huge" with vinyl. Maybe too huge? Try reducing the distance, a little bit at a time, not too much. You want to keep a wide soundstage, but increase the emphasis on the central image. Allow the stereo speakers to sound a bit more "mono" by reducing the distance between them. Finally, experiment with toe-in, to get the image just right.
Hopefully you will discover that the central image is in fact there, in your digital sources too. It is just that the speakers can be better aligned to the room.

